/*
 * Copyright 2010 Alessandro Bellucci
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.soupframework.gwt.designerpanel.client.command.impl;

import java.util.ArrayList;
import java.util.List;

import org.soupframework.gwt.designerpanel.client.command.Command;
import org.soupframework.gwt.designerpanel.client.command.CommandGroup;

public class CommandGroupImpl extends CommandBase implements CommandGroup {

	private String commandGroupType;

	private List<Command> commands = new ArrayList<Command>();

	CommandGroupImpl(String commandGroupType){
		this.commandGroupType = commandGroupType;
	}

	@Override
	public String getType() {
		return this.commandGroupType;
	}

	@Override
	public void addCommand(Command command) {
		if(this.isDone() != command.isDone()){
			throw new IllegalStateException("Cannot add Command to CommandGroup: executions states differ");
		}

		this.commands.add(command);
	}

	@Override
	public Iterable<Command> getCommands() {
		return new ArrayList<Command>(this.commands);
	}

	@Override
	protected void doCommandInt() {
		for(Command command : this.commands){
			command.doCommand();
		}
	}

	@Override
	protected void undoCommandInt() {
		// undo commands in reverse order
		for(int i = this.commands.size() - 1 ; i >= 0 ; -- i){
			Command command = this.commands.get(i);
			command.undoCommand();
		}
	}
}
